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Possible Duplicate:
Wireless doesn’t work on a Broadcom BCM4312

I installed Ubuntu 12.10 amd64 on a macbook 3,1. Wireless was working until I ran a "software update", and now I am without wireless.

I have an internal Broadcom Network Adaptor (BCM4321).

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marked as duplicate by Tom Brossman, fabricator4, Ringtail, Jorge Castro, Uri Herrera Dec 9 '12 at 8:50

This question was marked as an exact duplicate of an existing question.

Your problem looks similar to mine, and I think the new kernel and broadcom drivers are the connection. I ran

sudo apt-get install linux-headers-generic
sudo apt-get install --reinstall bcmwl-kernel-source
sudo modprobe wl

which I found here - Wireless does not work anymore after software update with Ubuntu 12.10 on a Dell Latitude E6230

and it worked for me on my Acer Laptop.

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